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 ###Instrução: Qual é o DuBose Porter com Roy Barnes a 54%?
 ###Tabelas: CREATE TABLE data (data_id AUTO_INCREMENT PRIMARY KEY, Name VARCHAR, Year INT, Landfall VARCHAR, NHC Advisory Number VARCHAR, V(mph) INT, R(miles) INT, Saffir-Simpson Category INT, CHI VARCHAR) CREATE TABLE democratic_primary (democratic_primary_id AUTO_INCREMENT PRIMARY KEY, Poll source VARCHAR, Dates administered VARCHAR, Roy Barnes VARCHAR, Thurbert Baker VARCHAR, DuBose Porter VARCHAR, David Poythress VARCHAR, Undecided VARCHAR) CREATE TABLE 2013_season (2013_season_id AUTO_INCREMENT PRIMARY KEY, Rank INT, Player VARCHAR, Year INT, Opponent VARCHAR, Passing yards INT, Rushing yards INT, Total offense INT) CREATE TABLE table_presidential_elections (table_presidential_elections_id AUTO_INCREMENT PRIMARY KEY, Election VARCHAR, Candidate VARCHAR, Number of votes VARCHAR, Share of votes VARCHAR, Outcome of election VARCHAR) CREATE TABLE season_2:_2009–11 (season_2:_2009–11_id AUTO_INCREMENT PRIMARY KEY, Series # INT, Season # INT, Title VARCHAR, Directed by VARCHAR, Written by VARCHAR, Original airdate VARCHAR)  
SELECT DuBose Porter FROM democratic_primary WHERE Roy Barnes = 54%